Update on Lilliput problem

Thanks for the replies guy,s . Spent most of today trying to sort the screen out , changed the earth,s to one point , then made one earth to the cab . Even earthed the cab to the shasey rail , all to no avail . Back down to the computer place , spent another hour with them trying everthing thay could think of . Then young Ben says to me "what happns when you plug the screen into the inverter " "don,t know " says i . Plug screen into inverter , turn on 240 v power , and the bloody thing works . So now , insted of running the computer on 240 v and the screen on 12v , i have the screen on 240v and the computer on 12v . Ah well , it filled in the day .